New Post: Product Carousel

Hello...
in all those past days I've tried to find out how to do what I explained above.
I simply cant find where I have to look to edit
[TAGXML:productcarousel.xsl:xmlgetproductsincat] in the way I explained above
and I'm not even able to understand what is the file to which the [TAGXML:productcarousel.xsl:xmlgetproductsincat] is pointing.

I hope someone will help me

Thank you

Pino